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Abstract：
The adsorption ability and photoactivity of a photocatalyst largely determine the mineralization efficiency of antibiotics. Herein, aiming to enhance the adsorption and mineralization of antibiotics, we constructed a hierarchical porous core-shell structure by filling amorphous TiO2 in the pores of Pt-doped mesoporous TiO2 crystals (MCs). The physical-chemical properties of the prepared samples were investigated by surface photovoltage spectroscopy, X-ray photoelectron spectroscope, etc. Adsorption and photocatalysis experiments were conducted with tetracycline hydrochloride as the model antibiotic. Pt nanoparticles doped at the interface of the rutile-amorphous homojunction remarkably enhanced the built-in electric field. The enhanced electric field increased the hole transfer to the catalyst surface, and the Pt doping treatment promoted the growth of amorphous TiO2 into the mesopores of the MCs. The optimization increased the surface area of the catalyst without increasing the thickness of the amorphous TiO2 shell, thereby reducing the charge migration distance from the core-shell interface to the catalyst surface. The adsorption amount and mineralization efficiency of tetracycline hydrochloride for the porous core-shell composite were 6.7 and 3.8 times of those for MCs, respectively.
摘要：
光催化剂的吸附能力和光活性在很大程度上决定了抗生素的矿化效率。在这里，旨在增强抗生素的吸附和矿化，我们通过在掺杂Pt的介孔TiO2晶体（MC）的孔中填充无定形TiO2来构建分层的多孔核-壳结构。通过表面光电压光谱法研究了制备的样品的物理化学性质，X射线光电子能谱仪,等。以盐酸四环素为模型抗生素进行吸附和光催化实验。掺杂在金红石-非晶同质结界面的Pt纳米颗粒显着增强了内置电场。增强的电场增加了空穴向催化剂表面的转移，Pt掺杂处理促进了非晶TiO2生长到MC的中孔中。优化增加了催化剂的表面积，而不增加无定形TiO2壳的厚度，从而减小了从核-壳界面到催化剂表面的电荷迁移距离。盐酸四环素对多孔核壳复合材料的吸附量和矿化效率分别是MCs的6.7倍和3.8倍。分别。
